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Intangible Assets and Liabilities - Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | $ 119,996 | $ 123,806
Intangible Assets, Accumulated Amortization | (60,578) | (58,834)
Intangible Assets, net | 59,418 | 64,972
Acquired Lease Intangibles, Net | 18,573 | 20,274
Below market leases [Member] |  |
Intangible Assets [Line Items] |  |
Acquired Lease Intangibles, Gross | 35,366 | 36,213
Acquired Lease Intangibles, Accumulated Amortization | (16,793) | (15,939)
Acquired Lease Intangibles, Net | 18,573 | 20,274
In-place lease value [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 104,705 | 108,060
Intangible Assets, Accumulated Amortization | (48,495) | (47,003)
Intangible Assets, net | 56,210 | 61,057
Tenant relationship value [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 10,580 | 11,201
Intangible Assets, Accumulated Amortization | (9,225) | (9,275)
Intangible Assets, net | 1,355 | 1,926
Above market leases acquired [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 4,711 | 4,545
Intangible Assets, Accumulated Amortization | (2,858) | (2,556)
Intangible Assets, net | $ 1,853 | $ 1,989

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